Question

Help, will medal =)

Answer 1

One answer is c, and you can see how i got that here http://www.tiger-algebra.com/drill/x2-3x-4=0/
I actually think the only answer is c

Answer 2

How sure are you about the only answer being C because I really need to get this question correct.

Answer 3

@jcoury

Answer 4

Well that's the one i know of and when i worked it out that's what i got you may want to do it yourself to compare

Answer 5

And E! which is 4 like in the link

Answer 6

hint:
you have to apply this formula:
\[\Large x = \frac{{ - b \pm \sqrt {{b^2} - 4 \times a \times c} }}{{2 \times a}}\]
where:
a=1,
b=-3,
c=-4
what do you get?